Communication system, a communication device and a frequency syn

Details Communication system, a communication device and a frequency syn Communication system, a communication device and a frequency syn

1998-12-04

2000-07-04

Tsang, Fan

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455265, 4551801, 4551803, 4551831, 4551881, 455 76, 375326, 375327, 375376, H04B 140, H04B 150

Patent

active

060850752

ABSTRACT:
A radio device has an antenna for receiving a radio frequency signal, and a radio frequency mixer for down-converting the received radio frequency signal to an intermediate frequency signal. The radio device further has a frequency synthesizer for generating a local oscillator signal for the radio frequency mixer. The frequency synthesizer has a first local oscillator loop for producing a band selective local oscillator signal, a second local oscillator loop for producing a channel selective local oscillator signal, and a local oscillator signal mixer for mixing the band and channel selective local oscillator signals. The band selective local oscillator signal selects a band, and the channel selective local oscillator signal selects a channel within the band. The generated local oscillator signal is an output signal of the local oscillator signal mixer.

REFERENCES:
patent: 5471652 (1995-11-01), Hulkko
patent: 5519885 (1996-05-01), Vaisanen
patent: 5630214 (1997-05-01), Yamamoto et al.
patent: 5809398 (1998-09-01), Mogerg et al.
patent: 5822366 (1998-10-01), Rapeli
patent: 5896562 (1999-04-01), Heinonen
patent: 5898907 (1999-04-01), Maruyama
patent: 5937335 (1999-08-01), Park et al.
By J. Crols et al. "A Single-Chip 900 MHz CMOS Receiver Front-End with High Performance Low-IF Topology", IEEE Journal of Solid State Circuits, vol. 30, No. 12, Dec. 1995, pp. 1483-1492.

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